Rotary grating machine



P. OEHMlG. JR

ROTARY GRATING MACHINE Filed March 25, 1925 2 Sheets-Sheet. 1

Sept. 1, 1925. 1,551,767

Sept. 1, 1925. 1,551,767

P. OEHMIG. JR

ROTARY GRATING MACHINE Filed llarh 25, 1925 2 Shuts-Sheet 2 IN win/7 04:

Patented Sept. 1, 1925. I

P.AUL OEHMIG, 3a., or CHICAGO, ILIQ'INOIS.

ROTARY GRATING MACHINE.

Application filed March 25, 1925. Serial No. 18,104.

To all whom may concern. ,Be it known that I, PAUL OEI-IMIG, Jr., a

citizen of th United States, and a resident of Chicago, in the county ofCook and State of Illinois, have invented certain new and usefulImprovements in Rotary Grating Machines,fof which the following is aspecification.

This invention relates to improvements in rotary'gratingmachines,heretofore consisting of a perforated grating cylinder, a casingtherefor, apower-driven shaft, provided with an exhaust fanlocatedinternally of the casing for discharging from the ma chineobnovious odors givenoif by the material being grated, and conductingthem to a point distant therefrom, such, for example, astheobnoiiiousodors given. off by horse radish.

The prime object of myinvention, broadly stated, is a rotary gratingmachine llTWlliCll the grated materials are confined to the periphery ofthe grating cylinder and discharged 'in their entirety therefrom, andfrom Wlnchmachme obnoxious odors are forcibly expelled by 'means locatedinternally of said cylinder. v v A More specifically stated, the objectof my invention is a rotary grating machine in which the grating surfaceis formed sepa rately from, surrounds and is mounted upon an imperforatepower driven cylinder from which the obnoxious odors are forciblyexpelled by fan blades secured to and suspended from the internalsurface of the cylinder. j a a Another-object of my invention is arotary grating machine, provided'with means for introducing air theretothrough the wall of the feed chute in the path of the materials to begrated, in their passage therethrough, and to discharge'the air so supplied axially of the grating cylinder.

.Another object of myinvention is a grating machine provided with meansfor holding the materials to be grated against the cylindrical gratingsurface, and which is adjustable for regulating and controlling thefineness or coarseness of the grated materials and for taking up wear,when of wood, which is the preferred material therefor.

"A further object of myinvention is a grating machine in which the feedchute is provided with means for preventing the lateral deflection ofthe materials passing through th chute to direct contact with thecylindrical grating surface.

lVith these ends in view, myinveution finds embodiment in certainfeatures of novelty 1n the construction, combination and arrangement ofparts by whichthe said objects and certain other objects are attained,all as hereinafter fully described with reference to the accompanyingdrawings and more fully pointed out in the claims.

In said drawings,- V

Fig. 1 illustratesa vertical longitudinal section taken on the line 11of Figs. 3 and 5 of the grating machine in which my invention findsembodiment.

Fig. 2 is a transverse section taken on the line 22 of Figs. 1 and 4.

v Fig. 3 is an end elevation.

Fig. 4 is a detail rear elevation of the feed chute and the air supplypipe therefor, taken on the line 44 of Fig.

Fig. 5 is an end elevation of the grating machine, showing the relativeposition of the air supply and discharge pipes thereto, taken'on theline'55of Fig. 1, looking in the direction of the arrows.

' Fig. 6 is a sectional view on line66 of i Figure 5. 1

Similar characters of reference indicate the same parts in the severalfigures of the drawings.

7 indicates a pedestal, provided-\vith a suitable base (not shown) forsupporting the machine of my invention from the floor in a positionconvenient forthe operator,"

from which post projects a bracket 8,

strengthened by web 9, the bracket and post being bored out and eachprovided with a lining 10 for a shaft 11. u I

Shaft 11 projects outwardly beyond the bracket 8 andhas mounted thereona pulley 12', secured to the shaft by set-screws 13, but may be by anyother suitable means, which. pulley, however, may be secured to theshaftand located in the recess l t in the bracket.

Shaft '11 projects outwardly beyond the pedestal 7 and has securedthereto a hub 15hy means of setscrews l6, 16, from which hub projects aweb 17, upon which is mountcd an imperforate open-end cylinder 18, the.periphery of which is surrounded by a grating surface, consisting of aband of sheet metal 19, provided with teeth 20, projecting outwardlytherefrom by punching.

Surrounding the rotating grater is a cylindrical casing 21, open at itsbottom and extending below the grater cylinder to form a chute throughwhich to discharge the grated materials, one of the side walls 22 forwhich is inclined, and the other side 23 straight, as shown in Fig. 1,but may both be inclined, as shown in Fig. 2, each of which walls isprovided with an outwardly projecting perforated flange 24, adapted forsecuring thereto an annular cover 2 by means of set-screws 25 or otherfastening devices suitable for a receptacle receiving the gratedmaterials.

Casing 21 is closed at one end by a circular plate 26, secured to thepost 7, preferably by casting it therewith, which plate is provided witha shoulder 27, forming a seat for the adjacent end of the casing,adjacent which the casing is provided with a flange 28 at intervals ofits circumference, and with lugs 29, receiving a set-screw 30, passingthrough the plate and the flange.

Casing 21 is provided with a longitudinal opening, surrounded by aninclined chute 31, through which to feed to the grating cylinder thematerials to be grated, which chute has preferably secured to each innerside thereof, plates 32, by means of screws 38, the inner edges 34 ofwhich plates are curved to conform to the grating surface opposedthereto, for preventing the grated materials from escaping laterallyfrom the chute.

Chute 31 also has an offset 35, providing a receptacle for an adjustablewooden block 36, extending the width of the chute, the function of whichis to adjustably control the uniformity and fineness of the gratedmaterial, to which end, a bolt 38 is projected through an elongated slot39 in the offset 85, on the screwt-hreaded end of which is a nut 40, forholding the block in its adjusted position, in which it is additionallymaintained by means of a key-bolt 41, adapted to abut against anend-plate 42, secured to the block and locked in its adjusted positionby means of a lock-nut 43.

In other words, the key-bolt is adapted for both taking up wear, rigidlylocking and preventing injury to the block from forces tending to bendthe bolt 38.

A further and important feature of my invention is a simple andeffective means for conducting into the grater cylinder obnoxious fumesas fast as they are formed in the feed chute of the machine, anddischarging them, together with those formed in and around the cylinder,to a point distant from the machine.

To these ends, the feed chute is provided transversely with an elongatedslot 44, in

open communication with a flanged hood 45, secured to the walls of thechute by setscrews 46, one end of which hood is closed as at 47 anddiverges thence to a coupling 48, connecting the hood with a bent pipe49, the other end of which is provided with a flange 50, secured bymeans of set-screws 51 to the adjacent endplate 52 for the cylindricalcasing, which end-plate is provided with an opening axial to thecylindrical grater, in open communication with and in register with thepipe 49, and through which and from the pipe 49, air currents aredischarged into the chamber formed by the disk 52 and said end-plate.

End-plate 52 is providednext its periphery (see Figs. 1, 3 and 5) with acircular slot 54, opening into a pipe 55, closed at its inner end 56,which extends across and closes the circular groove at that point.

Pipe 55 is spirally arranged with reference to the end-plate 52 and isgradually increased in size from its inner end 56 to its outer anddischarging end 57, whence it extends tangentially with reference to itsaxis and is adapted to be coupled with another pipe (not shown) forconducting the air currents therefrom outside of the room in which thegrating machine is located, or to any other distant point therefrom thatmay be desired.

End-plate 52 is secured in and to the end of casing 21 by means of a bar58, attached to the periphery of the cylinder and to the spiral pipe 55by means of set-screws 59, 59, and by one or more set-screws 60,projecting through the flange 23, secured into the spiral pipe 55, aswill be seen by reference to the bottom portion of the casing 21 inFigs. 3 and As a means for forcibly abstracting obnoxious fumes as fastas they are formed in the feed chute for conducting them into the gratercylinder and expelling them from the machine, together with the fumesformed in the cylinder and the casing, a number of spaced fan blades 61(see Figs. 1 and 2) are secured to and depend from the inner surface ofthe cylinder 18, which suspended fan blades are located between the disk17 and the inner ends of the axial opening 53 and circular slot 54, andsecured in their operative position by any suitable means, butpreferably by casting them with the cylinder and with the disk, asindicated in the drawings.

In Fig. 2, is shown a pusher block 62, provided with a suitable handle63, as a means for facilitating the feeding of the materials and forforcing them against the grating surface.

In operation, with the cylinder in open con'nnunication with the feedchute and revolving in the direction indicated by the arrow in Fig. 2. avacuum will be produced in the feed" chute inducing "air currents,conducting the fumes from thechute into the cylinder, which fumes,together with those formed in the-cylinder, and casing,

, will, through the centrifugal force of the 7 fan, bedischarged'through the hoodinto end wall 56 of th spiral pipe, and soshort a time that there is no possibility for any of the fumes inanypart of the machine escapingtherefrom in the presence of theoperator,or into the room in which the grating machine of my inventionis located.

My invention, however, is not to be limited to the details ofconstruction herein shown and described, such, for example, as forthe'form of the bend for the pipe 49 throughwhich the fumes forming inthe feed chute are conductedinto the cylinder for the grater, or to thespiral formation and to increasing theIdiameter of the dis charge pipe55, or the length and -curva-ture of the slot 54, so long astheseseveral parts and features are adapted for producing the resultsattributable to my invention as particularly pointed out anddistinctively set forth in appended claims.

Having described my invention, what I claim and desire to secure byLetters Patent is: i

1. A grating machine, comprising in com bination a grating surface, animperforate cylindrical support therefor, and spaced fan blades locatedwithin said cylinder.

2. A grating machine, comprising in com bination a grating surface, animperforate cylindrical support therefor, and spaced fan blades locatedwithin and suspended from the inner walls of said cylinder.

3. A grating machine, comprising in combination a grating surface, animperforate cylindrical support therefor, a disk 'trans-.

versely dividing said cylinder, a casing surrounding sa d cylinder andsurface closed at one end and provided with openings in its oppositeend, and fan blades suspended I from the inner walls of the cylinderlocated between said dislrand end-plate openings.

4. A grating machine, comprising in combination a grating surface, animperforate cylindrical support therefor, a disk transversely dividingsaid cylinder, a surrounding casing closed at one end and provided atits opposite end with an axial opening, and with a circular slotsurrounding said opening, and spaced fan blades located between saiddisk and opening, adapted for inducing air currents into and dischargingthem from the cylinder and easing.

5. A grating.machine,comprising in com-- bination an imperforatecylinder, a grating surface mounted thereon, a casingsubstantiallysurroundingsaid cylinder and surface, havinganaxialopeningat one endthereof, afeed chute secured to said casing, providedwith an opening at one side thereof towards'its inner end, a hood and apipe connecting the feed chute with the cylinder in open communicationwith the opening in the feed chute and the axial opening in the casing,and means for discharging from the casingair currents passing from thefeed chute into the cylinder.

6. A grating machine, comprising in combination a grating surface, an.imperforate cylindrical support therefor, a fan secured to and revolvingwith said cylinder, and a casing substantially surrounding said cylinderand surface, w ich' casing is provided withan inlet and an outlet forair currents produced by said fan. i

. 7 A gratingmachine, comprising in combinationa grating surface, animperforate cylindrical support therefor, a fixed casing substantiallysurrounding said surface and support closed at one end and provided atits opposite end with an axially located opening and inwardly adjacentfrom its periphery with a curved slot, and a hood extending over andclosing said slot at one end, provided with an extension for con ductingobnoxious fumes from the machine to a point distant therefrom.

8. A grating machine, comprising in combination an imperforate cylinder,a grating surface mounted thereon, a casingsubstantially surroundingsaid cylinder and surface, provided at one end withan axial openingthrough which to conduct obnoxious fumes into the cylinder, a feedchute,

and means connecting the feed chute with and in open communication withsaid axial opening.

p 9. A grating machine, comprising in combination a rotatable gratingsurface, a casing substantially surrounding and enclosing saidsurface,,one end of which is provided with an air inlet and a' circularslot surrounding and spaced therefrom, and a pipe closed at one end inopen communication with said slot. for discharging obnoxious odorsformed in the cylinder and casing at a point distant therefrom.

10. A grating machine, comprising in combination a rotatable gratingsurface, a casing substantially surrounding and enclosing said surface,one end of which is provided with an air inlet and a circular slot withan air inlet and an air outlet adjacently below the periphery of thecasing, and a fan located within the cylinder adapted in operation toproduce an exhaust adjacent the air inlet and to forcibly expel the airthrough said outlet and thereby discharge obnoxious fumes supplied toand formed within the casing therefrom.

12. A grating machine, comprising in combination a drive shaft, acylindrical grater mounted upon and operated by said shaft, a casing forsaid grating cylinder, one end of which is provided with an air supplyinlet opening internally of the cylinder, an air outlet located adjacentthe periphery of the casing, and fan blades located internally of andsuspended from the grater cylinder.

13. A grating machine, comprising in combination a rotatable shaft, adriving pulley secured thereto, a grating surface connectedwith androtated by said shaft, a cylindrical casing converging below its bot--tom to provide a discharge chute therefor, and with a feed chute andwith end plates, one of which end plates is provided with an axialopening into the cylinder connected with the feed chute, and alsoadjacentits periphery with a discharge opening through which todischarge obnoxious odors accumu lating within the casing and cylinderto a point distant therefrom.

14. A grating machine, comprising a rotatable cylindrical grater, ahousing surrounding the same, a feed chute peripherally of and in opencommunication with the grating surface of the'cylinder, and plateslocated internally of and at opposite sides of the feed chute, the edgesof which are curved to conform to the surface of the grating cylinderand adapted to prevent the materials passing through the feed chute fromdischarging laterally thereof and longitudinally of the cylinder.

15. A grating machine, comprising in combination a cylindrical grater, ahousing, a feed chute, an adjustable block forming a part of the feedingsurface of the feed chute for regulating the fineness of the grating ofthe materials supplied to the surface of the grating cylinder, and meansfor adjust-- ing said block and taking up the frictional wear thereof.

In witness whereof, I have hereunto set my hand this 21st day of March,1925.

PAUL ()EHMIG, JR.

